Multiple Soft Photon Bremsstrahlung on the Z Resonance

1990 ◽  
pp. 89-106
Author(s):  
H. Spiesberger
Keyword(s):  
Soft Photon

scholarly journals Classical sub-subleading soft photon and soft graviton theorems in four spacetime dimensions

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Biswajit Sahoo
Keyword(s):  
Fourier Transformation ◽  
Soft Photon ◽  
Scattering Process ◽  
Retarded Time ◽  
Long Wavelength ◽  
Macroscopic Objects ◽  
Loop Amplitudes

Abstract Classical soft photon and soft graviton theorems determine long wavelength electromagnetic and gravitational waveforms for a general classical scattering process in terms of the electric charges and asymptotic momenta of the ingoing and outgoing macroscopic objects. Performing Fourier transformation of the electromagnetic and gravitational waveforms in the frequency variable one finds electromagnetic and gravitational waveforms at late and early retarded time. Here extending the formalism developed in [1], we derive sub-subleading electromagnetic and gravitational waveforms which behave like u−2(ln u) at early and late retarded time u in four spacetime dimensions. We also have derived the sub-subleading soft photon theorem analyzing two loop amplitudes in scalar QED. Finally, we conjectured the structure of leading non-analytic contribution to (sub)n-leading classical soft photon and graviton theorems which behave like u−n(ln u)n−1 for early and late retarded time u.

scholarly journals Infinite-dimensional fermionic symmetry in supersymmetric gauge theories

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Thomas T. Dumitrescu ◽  
Temple He ◽  
Prahar Mitra ◽  
Andrew Strominger
Keyword(s):  
Ward Identity ◽  
Gauge Theories ◽  
Soft Photon ◽  
Supersymmetric Gauge Theories ◽  
Null Infinity ◽  
Infinite Dimensional ◽  
Charged Matter ◽  
Gauge Symmetries ◽  
Supersymmetric Gauge

Abstract We establish the existence of an infinite-dimensional fermionic symmetry in four-dimensional supersymmetric gauge theories by analyzing semiclassical photino dynamics in abelian $$ \mathcal{N} $$ N = 1 theories with charged matter. The symmetry is parametrized by a spinor-valued function on an asymptotic S2 at null infinity. It is not manifest at the level of the Lagrangian, but acts non-trivially on physical states, and its Ward identity is the soft photino theorem. The infinite-dimensional fermionic symmetry resides in the same $$ \mathcal{N} $$ N = 1 supermultiplet as the physically non-trivial large gauge symmetries associated with the soft photon theorem.

scholarly journals Soft photon problem in leptonic B-decays

2009 ◽  
Vol 681 (3) ◽  
pp. 257-263 ◽  
Author(s):  
Damir Bećirević ◽  
Benjamin Haas ◽  
Emi Kou
Keyword(s):  
Soft Photon ◽  
B Decays

scholarly journals Soft-photon radiative corrections to the e−p→e−pl−l+ process

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
Matthias Heller ◽  
Niklas Keil ◽  
Marc Vanderhaeghen
Keyword(s):  
Soft Photon ◽  
Radiative Corrections

Preliminary results on direct soft photon production in π−p interactions at 280 GeV/c

1991 ◽  
Vol 525 ◽  
pp. 487-490 ◽  
Author(s):  
S. Abatzis ◽  
S. Banerjee ◽  
D. Barberis ◽  
A. Belogianni ◽  
W. Beusch ◽  
...  
Keyword(s):  
Photon Production ◽  
Soft Photon ◽  
Preliminary Results

Note on the Brown-Goble soft-photon approximation

1980 ◽  
Vol 22 (2) ◽  
pp. 527-529 ◽  
Author(s):  
Leonard Rosenberg
Keyword(s):  
Soft Photon

The Tipsy single soft photon detector and the Trixy ultrafast tracking detector

2012 ◽  
Author(s):  
Harry van der Graaf ◽  
Michiel Bakker ◽  
Hong Wah Chan ◽  
Edoardo Charbon ◽  
Fabio Santagata ◽  
...  
Keyword(s):  
Soft Photon ◽  
Photon Detector ◽  
Tracking Detector
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